/* p_and_s.c -- 指针和字符串 */
#include <stdio.h>
int main(void)
{
    const char *mesg = "Don't be a fool!";
    const char *copy;
    copy = mesg; // 把mesg的值赋给copy，即让copy也指向mesg指向的字符串。
    printf("%s\n", copy);
    printf("mesg = %s; &mesg = %p; value = %p\n", mesg,
           &mesg, mesg);
    printf("copy = %s; &copy = %p; value = %p\n", copy,
           &copy, copy);
    return 0;
}